Phonograph.



C. H. ROOF.

PHoNoGRAPH. APPLICATION FILED 1UNE29. 1914.

luwutvd luml 22, 1915.

an vanto@ witnwom @WRENCH H. R001?, Oli' CAMDEN, JRSEY, ASSIGNOJB, 0F ONEJPHIRD T0 WALT. HAVENS, F JBELEORJD, NEW HAVEN S, 0E' CMJDEN, NEW JEiSEY.

JERSEY, AND

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Specification of Lettera Patent.

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T0 all 'Lv/0m it may concern;

Be it known that l, CLARENCE H. Roer, a citizen of the United States, residin l at Camden, in the county of Camden and tate of New Jersey, have invented certain new and useful lmprovements'in Phonographs, of which the following is a specification.

My invention relates to improvements in phonographs, and more particularly to an improvedattachment for the phonograph diaphragm, said attachment constituting a atv ternal shoulder 7, and the t titl Vmetallic and scraping sounds so sound rectifier operating to eliminate the common with sound reproducers in general use.

A further object is to provide an vattachment of the character statedwhich can be connected to any ordinary diaphragm, utilizing for the purpose the screw which is com.- monly employed to connect the stylus bar to the diaphragm.

With these and other objects in view, the invention consists in certain novel features rangements of' parts as will be more fully hereinafter described and pointed out in the claims.

I ln the accompanying drawings: Figure l is a view in longitudinal section illustrating my improved attachment inoperative position, and Fig. '2 is a perspective view of the attachment removed.

l represents'y a sound box of the ordinary type having a diaphragm 2 therein of mica or other suitable material such as commonly employed and to which the ordinary stylus bar 3 is secured.

t represents my improved attachment which in the form illustrated, is of general conical shape, and is secured by a screw 5 to the center the point of attachment of the stylus bar 3.

The-screw 5 is the screw which. is ordinarily employed for securing the stylus bar to the diaphragm, and when used for connecting my improved attachment, is posiof the attachment with thev tioned inside head 6 of the screw bearin against an in'- readed portion of the screw projecting through the end of the attachment, through a central opening in the diaphragrmand screwed into the socket 8 which is tapped in the end'of the lof aluminum and` vat its center anden construction and combinations and arof thediaphragm 2 opposite stylus bar. Hence to connect my improved attachment to any ordinary diaphragm, it is simply necessary to remove the screw and utilize the same as a securing device as above described.

v'llhe attachment in its preferred form is conical in shape, but l would have it understood that ll do not limit myself to the particular material employed, nor to the precise shape, as a wide range of modilication'is possible with varying results. ln any event, it is my purpose to secure the attachment tothe diaphra the side thereof adJacent the sound tube or horn.- 'llhis is shown clearly in Fig. 1, in which it will be seen that the attachment 4 is located centrally within the opening 9 and concentric with the sleeve l0 which is connected to the sound arm or horn, hence the sound waves pass around the attachment at all sides thereof. l

As above stated, the attachment is designed to prevent the transmission of metallic and scraping sounds which are so common in phonographs, and hence ll term the device a rectifier because it rectiies the sound and causes the same to he reproduced in its natural state, and ll do not limit myself to the precise details set forth, but consider myself at liberty to make such changes and alterations as fairly fall withinthe spirit and scope ofthe appended claims.`

Having thus described my what l claim as new and deslre by Letters Patent is:

1, The combination with 'a diaphragm, and a stylus bar, of a hollow conical rectiinvention,

fier having its smaller end secured to the to securev side, and a stylus bar positioned at one 'side of the diaphragm, of a hollow conical rectifier having its smaller end secured to the center of the diaphragm, and its larger end Q' I means@ projecting centrally into the. sound passage, name to this specification in the presence said (l'ecler k'mgl Seoul-eg by a, dscrlw Vpdlroof two subscribmg Witnesses jlecte t roug t e rect er an t e iaphragx'n and screwed into the stylus bor, CLARENCE H' HOOP' 5 `clamping theparts together, substantislly Witnesses:

as descrlbed. E.-WALT. H AvmNs,

In testimony whereof I have signed my M. E. Dm'ms. 

